Do not have an onoff switch. Installing 2 way switches are easy.
Electrics Two Way Lighting
Difference between 2 way and 3 way light switch. A pair of two way switches is used to allow a lamp to be operated from two different locations such as from the bottom or top of a staircase. Take a look at the switches in your home. These switches dont have hot wires. In north america for some odd reason a two way. A three way switch has no marking because there is no consistent on or off position. These switches have hot wires.
The on off can change depending on the position of the second three way switch. Single pole switches with one switch controlling one light are marked with an on and off position. In a normal switch the two terminals are either connected as shown or disconnected. These have onoff switches. This type of switch must be combined between two three way switches to form a circuit. These switches use only 2 types of wires.
While more uncommon this is a good option for large rooms with several entrances. These switches have 3 terminals. A four way switch is similar to a three way except it has four terminals plus a ground terminal and controls one fixture from three locations. When they are connected the switch is on in a three way switch the top terminal connects to one or the other of the bottom two terminals. These switches use 3 types of wires. These switches actually have 4 terminals.
Gallery of Difference Between 2 Way And 3 Way Light Switch
